Y2 Project Week 2

Week 2

Revision:

In this week's lab time, we do the revision for the week 1 in order to remember the key point.  We simulate the circuit in week 1 and then display the wave in oscilloscope to prove the feasibility of this circuit.  The figure is displayed to show the power factor correction:

Figure 1

Design circuit:

After the tutorial with supervisor, we have designed a circuit to the realize the function of change different capacitor to select the best capacitor to ensure the value of power factor is the closest to the 1.  The idea is that we can design three branches in parallel and all of them are controlled by the capacitor.  When the voltage of the bipolar junction transistor reach the specific value, the branch can be connected.  The figure of the branch in the circuit is displayed in the figure 2 and figure 3:

Figure 2

Figure 3

However, when we used this circuit in the real circuit, we found a problem is that there is no change for the voltage of BJT when we changed the supply voltage.  Therefore, we need more discussion and practice in next week in order to solve this problem.

The code for the ARM 

In this week's lab time, we also discussed the code for the ARM in order to realize the function of the ARM can select the best capacitor after the calculation of the power factor.  We searched the Internet and found some similar code in Arduino language which is similar to the ARM.  Therefore, we decided to transfer the code into the ARM language in next week.